Resistor Color Code Calculator
Convert between resistance values and 4-, 5-, or 6-band markings, including tolerance and temperature coefficient where applicable.
About CircuitKitchen
Useful answers for circuit design.
CircuitKitchen is a collection of practical calculators for circuit design.
Why CircuitKitchen exists
Circuit design involves more than finding a nominal value. Component tolerances, loading, and operating conditions affect how a circuit performs. CircuitKitchen brings calculations, comparisons, and explanations together so you can check a component value, explore alternatives, and see how design choices affect the results.
CircuitKitchen draws on 40 years of hands-on electrical engineering experience to support practical circuit design. Its calculators help engineers, technicians, hobbyists, and students evaluate options and understand the results—from quick component checks to tolerance analysis and resistor selection.
What you can do
SMD Resistor Code Calculator
Decode resistor markings or find the code for a resistance value using 3-digit, 4-digit, and EIA-96 formats.
Voltage Divider Calculator
Calculate output voltage or solve for a resistor value, evaluate loading and tolerance effects, compare standard resistor choices, and estimate required power ratings using adjustable utilization and temperature assumptions.
Calculations update as you change the inputs, making it easy to explore alternatives.
Understand the results
Each calculator explains its methods, assumptions, and results so you can assess how they apply to your design. Where supported, results include tolerance ranges and worst-case values alongside nominal calculations. Check the selected component’s datasheet for specifications and operating limits that the calculator does not model.
Privacy and feedback
Read the Privacy Policy, or use a calculator’s Feedback button for anonymous suggestions.
Contact
Use the Contact page for questions, requests, or concerns that need a reply.